is OAP used?

Some time back we implemented OAP to add an authentication layer to the IPA, IIRC aimed at osmo-bsc_nat <-> MAP proxy to do milenage mutual auth. Now the oap protocol code is in libosmocore, but the oap_client code is dup'ed in osmo-{bsc,sgsn}.git. I would move the oap_client to libosmocore as well. But all the while I'm not really certain that it is indeed being used. osmo-sgsn has vty config for it, but I'm certain osmo-hlr doesn't bother to implement the OAP server part (there's code but in #if 0). osmo-bsc_nat remains, and possibly a GSUP counter part to the osmo-sgsn that I'm not using (presumably the MAP proxy)? Is anyone using OAP and the oap_client and is it worth the effort to keep it? Can we / should we just drop OAP instead? Thanks, ~N